Electric signal-bell.



H. W. EDEN.

ELECTRIC SIGNAL BELL.

APPLICATION nun JAN. 4, 1908.

Patnted Jan. 5,1909.

HAROLD W. EDEN, OF DETROIT, MICHIGAN.

ELECTRIC SIGNAL-BELL.

Specification of Letters Patent.

Patented Jan. 5, 1909.

Application filed January 4, 1908. Serial No. 409,257.

To all whom it may concern:

Be it known that I, HAROLD W. EDEN, a citizen of the United States, residing at Detroit, county of Wayne, State of Michigan, have invented a certain new and useful Improvement in Electric Signal-Bells, and de clare the following to be a full, clear, and exact description of the same, such as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

This invention relates to electric signal bells, and has for its object an improved contact point supporting post and an improved insulating means for securing a binding post to the body of the bell.

In the drawings z-Figure 1, is a plan view showing the location of the parts. Fig. 2, is an elevation of the contact supporting post. Fig. 3, is a section, showing the means of securing the contact holding ost. Fig. 1, shows the means of securing a inding post to the body of the bell.

The binding post 1 is made from a strip of sheet metal bent with a flat face 2 to engage against the base with an inter osed insulating piece 9, and from the flat ace of piece 2 rise side members 3 and 4, which are brought together at 5. From 5 the two members spread to form a passage for the screw 8; they are brought together again at 6, and held by a clamping screw 7. The passage between 5 and 6 is threaded for the stem of the screw 8. The screw 8 carries the contact point and is adjustable through the passage in which it is held. The clamping screw 7 serves to draw the members together against the stem of the screw 8. The post is secured to the base by seating it on an insulating plate 9, which itself is seated on the u per surface of the base over an opening or ho e 10 that passes through the base. On the under side of the base is seated an insulating plate 11, and the plates 10 and 11 are held together by screws 12 and 13. A binding screw 14 is run through a threaded hole in one member 4 of the binding post, and furnishes a clamp for the terminal of the conducting wire. The binding post at the opposite side of the bell body, or of the second terminal of the wires, is somewhat similar in its structure to the securing part of the post just described. I'prefer, however, to employ metallic plates on both sides of the insulating members, and in order that they may be simply and cheaply made and readily a plied I make these plates with a right and le t end, but the two are alike; the plate 24 is punched with a sharp punch preparatory to finishing the hole for the screw 15. The part of the I metal forced out by the punch is expanded until it is of the proper size, and is threaded to engage the screw 15; the ex anded part of the metal furnishes material for a comparatively long run of threads, two, three, or four turns. The end of the plate 24 op osite the threaded part is punched with a lunt punch for the passage of the body of the screw 17. The plate 27, which is employed on the opposite side of the body of the bell, is made 1n the same manner with the hole 17 punched with a sharp punch, expanded and threaded, and with the hole through which the screw 15 passes punched with a blunt punch, and not expanded. The two plates 24 and 27, with the threaded screw hole of one arranged to register with the smooth hole of the op osite piece, are placed on the bell body witli interposed insulatin pieces 18 and 19, embracing the rim aroun an oblong hole through the base; preferably the base is rabbeted around the rim to allow the insulating pieces and the holdin plates to sink until their surfaces are siibstantially flush with the surface of the base, especially on the upper side. The screws are run into place, and the screw 15, which extends above the surface of the plate 14, receives a washer 20, and a binding nut 21, which completes the binding post.

What I claim is 1. In combination with a bell base having an apertured portion, the peripheral edge of which is rabbeted, a pair of insulating plates adapted to engage thereover on opposite sides of the base, said plates being provided with holes adapted to register with one another, a binding post resting on the upper one of said plates, and securing screws by one of which said binding post is held in place, passing through the plates and the aperture in the base, substantially as described.

2. An insulating binding post, having in combination oppositely arranged plates, each of which is provided with one screw threaded hole and one unthreaded hole, the screw In testimony whereof, I sign this specificathreadefil holehofftgiedolrl elbeifn "arrangeld opg tioniir thepresenoe of two; Witnesses}.

ositet eunt'rea 'e' oeo t ese'con I an Securing screws run into said screw threaded HAROLD EDEN 5 holes, one of said securing-screws projecting Witnesses:

above the plate and receiving thereon a CHARLES T. BURTON, binding nut, substantially as described. I VIRGINIA C. SPRATT. 

